Home / 28,361.87-39,138.71-15,786.35

Finding the Fourth Proportional to 28,361.87, 39,138.71 and 15,786.35

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Solution

The fourth proportional to 28,361.87, 39,138.71 and 15,786.35 is: 21,784.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,361.87 : 39,138.71 = 15,786.35 : x
  2. Step 2: Convert to fraction form
    28,361.87/39,138.71 = 15,786.35/x
  3. Step 3: Cross multiply
    28,361.87x = 39,138.71 × 15,786.35
  4. Step 4: Simplify right side
    28,361.87x = 617,857,374.61
  5. Step 5: Solve for x
    x = 617,857,374.61/28,361.87
  6. Step 6: Final answer
    x = 21,784.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.